Section
Guides
11 pages in this section, most recently updated October 2, 2026. Each opens with a plain-English summary and cites its sources.
01 · Guides
FeaturedHow to use the dose unit converter
You'll get: The converter turns the dose on your prescription and the strength on your vial into millilitres and syringe units.
A walkthrough of the converter: what to type, what each result means, and the two checks that catch almost every drawing-up error before it happens.
Updated September 4, 2026
02 · Guides
FeaturedUnits versus mL: the mistake that changes a dose tenfold
You'll get: Syringe units measure volume, not drug. On a U-100 syringe, 100 units equals 1 millilitre.
Why syringe units are a volume scale, how one word means three different things, and the arithmetic that keeps a 0.25 mL dose from becoming 2.5 mL.
Updated September 4, 202603 · Guides
How to read the concentration on a compounded vial
You'll get: A compounded vial's label shows its strength, and that one number drives every dose calculation.
The four ways a pharmacy writes concentration, how to turn each into mg/mL, and what to do when the label and the prescription disagree.
Updated September 4, 202604 · Guides
Syringe graduations and rounding: why the 0.3 mL syringe exists
You'll get: A syringe can only be read to its smallest mark, so small doses need small syringes.
How the three common insulin syringe sizes are marked, how much rounding each one forces on a small dose, and how to pick a syringe so the rounding error stays trivial.
Updated September 4, 202605 · Guides
FeaturedHow to use the injection schedule generator
You'll get: You enter a start date and dose steps. The tool dates every shot and exports a calendar file.
Turn a start date and your prescribed dose steps into dated injections and a calendar file, with the label rules the templates follow.
Updated September 4, 202606 · Guides
FeaturedWhat a population average means: reading the weight-loss projection
You'll get: The projection scales a published trial endpoint to your starting weight and uses a formula for intermediate weeks.
Where the STEP 1 and SURMOUNT-1 numbers come from, what the curve between week 0 and the endpoint is and is not, and the three reasons your own result will differ from the line.
Updated October 2, 202607 · Guides
Cost per mg: comparing quotes that are written differently
You'll get: GLP-1 prices are quoted per pen, per vial or per month, so they are hard to compare directly.
How to put a per-vial price, a per-month program and a per-pen list price on one scale, why a month is 4.33 weeks, and where waste hides.
Updated September 4, 202608 · Guides
BMI: what it measures, and where the label thresholds come from
You'll get: BMI is your weight divided by your height squared. It is a quick ratio, not a measure of body fat.
The formula, the WHO categories, why the Wegovy and Zepbound labels mention 27 and 30, and what BMI cannot tell you about your body.
Updated September 4, 202609 · Guides
Protein targets on a GLP-1: how the arithmetic works
You'll get: A protein target is your body weight times a factor, and the factor depends on which source you use.
Where the 0.8, 1.2 to 1.6 and 1.4 to 2.0 grams-per-kilogram figures come from, which body weight to multiply, and how to split the total when appetite is the limiting factor.
Updated September 4, 202610 · Guides
Reconstitution arithmetic for pharmacy-dispensed vials
You'll get: Some compounded products come as a powder you mix with liquid. Strength equals powder milligrams divided by liquid millilitres.
How powder mass and liquid volume become a working strength, why more liquid changes the volume but not the dose, and how to check the pharmacy's numbers.
Updated September 4, 202611 · Guides
Five checks before every injection
You'll get: Before each shot, confirm the day, the dose step, the vial strength, the syringe size and the pharmacy's instructions.
A short, repeatable routine that catches concentration changes, unit confusion, wrong syringes, wrong days and wrong steps before the needle goes in.
Updated September 4, 2026